名词
中文翻译：洋底地壳
同义词：
['seafloorcrust', 'ocean floor crust']
例句：
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1. The oceanic crust is theoldest part of the Earth's crust.
洋底地壳是地球最古老的部分。
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2. The oceanic crust is made upof rocks that are millions of years old.
洋底地壳由数百万年历史的岩石组成。
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3. The oceanic crust is wheremost of the world's oceansare located.
洋底地壳是大多数世界海洋的所在地。